hrmm i think this building is trying to tell me something? what is that? oh, how rude

St. Patrick's Catholic Church, a Roman Catholic church in San Francisco, California, founded in 1851. It is located at 756 Mission Street, between 3rd and 4th streets, across the street from Yerba Buena Gardens, in front of a much taller glass tower

the glassthe glass tower, church cropped out, something in a window in the top left corner

in a window in the top left corner: L